Post single/multiple time-series metrics.
NOTE: only metrics of type 'gauge' and type 'counter' are supported.
You must use a dogstatsd client such as Net::Dogstatsd to post metrics of other types (ex: 'timer',
'histogram',
'sets' or use increment() or decrement() on a counter).
The primary advantage of the API vs dogstatsd for posting metrics: API allows posting metrics from the past.

Per DataDog: "The metrics end-point allows you to post metrics data so it can be graphed on Datadog's dashboards."